In this Feb. 13, 2015 photo, construction worker David Rager, 53, frames the upper floor of a two-story custom home being built in Orlando, Fla. As construction jobs return in some regions, competition for skilled labor is heating up.(AP Photo/Phelan M. Ebenhack)

In this Feb. 13, 2015 photo, construction worker David Rager, 53, frames the upper floor of a two-story custom home being built in Orlando, Fla. As construction jobs return in some regions, competition for

FILE - In this Aug. 15, 2014, file photo, a car drives past a memorial in the middle of the street where Michael Brown was shot by police in Ferguson, Mo. Six months after 18-year-old Michael Brown died in the street in Ferguson, Missouri, the Justice Department is close to announcing its findings in the racially charged police shooting that launched "hands up, don't shoot" protests across the nation. (AP Photo/Charlie Riedel, File)

FILE - In this Aug. 15, 2014, file photo, a car drives past a memorial in the middle of the street where Michael Brown was shot by police in Ferguson, Mo. Six months after 18-year-old Michael Brown died in the

This undated image released by Google on Monday, March 2, 2015 shows the company's Trekker device on a zipline above the Amazon jungle in South America. The images taken by the Trekker are the latest addition to the diverse collection of photos supplementing Google’s widely used digital maps. (AP Photo/Google)

This undated image released by Google on Monday, March 2, 2015 shows the company's Trekker device on a zipline above the Amazon jungle in South America. The images taken by the Trekker are the latest addition